Questions tagged [blood-tests]

Questions about tests of the blood that help to estimate the component(s) in it.

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26 views

What's the term for fainting when you get a needle without apprehension?

So I will often faint when I get a needle, both for vaccinations and blood tests. This is not because I have any apprehension about the needle. If I lie down for the needle rather than sitting it has ...
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16 views

Does half a gram/dl Hb increase have clinical significance?

In relation to an Indian paper that attributed this observed change to a mask mandate (also being discussed on Skeptics) Mean Hb of blood donors in Group 2 (15.01 ± 1.1 g/dl) was higher than Group1 (...
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23 views

Is it considered eosinophilia if the total eosinophil count is normal but the eosinophil percentage is high?

If the total eosinophil count is normal but the eosinophil percentage is high, is it considered eosinophilia, or is it merely grounds for a rerun of the test? In a paper by Kovalski and Weller (2016), ...
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67 views

The state of glucose in the blood

I have a simple question regarding glucose and the blood, for which I have not been able to find a satisfactory answer through some independent research through Google. How is the glucose in the blood ...
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60 views

Blood count and adenovirus vaccines

Some covid-19 adenovirus vaccines including AstraZenca and Johnson & Johnson are found to have potential link to a rare albeit serious side effect resulting in blood clots with low platelets, ...
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17 views

Does Water Affect Aggregation/Clumping of Red Blood Cells?

I am developing a laboratory experiment that involves looking at human blood under a microscope. In particular, I will be looking at how the red blood cells aggregate or clump when a human subject is ...
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1answer
65 views

What would be the chances of catching HIV when getting a blood donation from a man who has sex with Men?

Around the world organizations that seek blood donations usually have a policy to discourage men who have sex with men (MSM) from donating blood. This is due to the risk of Human Immunodeficiency ...
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421 views

How does a MRSA test work?

Let's assume we have a patient with acute infection. The doctor suspects MRSA. A culture is taken, brought to the lab, and then what? I'm interested to hear what are the usual steps a laboratory ...
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3k views

Can eating chalk cause very low level haemoglobin level?

My friend has a haemoglobin level of 6 g/dl. She eats a lot of chalk. The doctor said that the chalk accumulation is hindering the production of haemoglobin. Does that make sense, or there might be a ...
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31 views

Will there be any error in the result if the sample taken for COVID-19 RT PCR test is kept for days before performing the test?

What would be the impact of keeping the sample (nose swab) for 5 days before performing RT-PCR on it? If no, then is there a particular way of storing the sample. Is there any standard set by the ...
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23 views

Timeframe of MMA / HCY response to Vitamin B12 supplementation

What is the timeframe one can reasonably expect for elevated serum Methylmalonic Acid and Homocysteine levels to be normalized by supplementation (e.g. 250 μg daily cyanocobalamin), assuming ...
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12 views

Why is there a difference between venous bicarbonate and bicarbonate in ABG?

Lets say a serum blood test shows bicarbonate of 20mmol/l but an ABG of 15mmol/l, both tests taken 3 minutes apart in a person with acute metabolic acidosis with compensation. Can anyone explain why ...
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22 views

Blood pH when exercising. Rising pH? Maybe somehow related to lactic acid and hyperventilation [closed]

Exercise generally acidises the blood. I'm looking for information on the timing of onset and how long this lasts after the exercise. Furthermore, I'm looking for info on alkalization of blood caused ...
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32 views

If an HIV test was done using a chemiluminescent microparticle immunoassay (CMIA), does it mean it screens for HIV 2 and/or is a 4th generation test?

If an HIV test was done using a chemiluminescent microparticle immunoassay (CMIA): does it mean that it screened for HIV 2 and/or is a 4th generation test? On http://www.uphs.upenn.edu/bugdrug/...
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37 views

Can certain medications cause false positives for COVID-19?

I was told by some colleagues at work that certain medications if they were taken by a person can cause antibody COVID-19 tests to test positive, is it possible ? If so how is that possible ?
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DIY hypernatrimia test

Is there a reliable, accessible blood test kit that can be administered at home to monitor hypernatrimia ? I understand that because sodium does not produce colored compounds, serum sodium cannot be ...
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38 views

Is low immature reticulocyte fraction after an acute hemolytic crisis normal?

All following data are theoretical and not real: A patient had a hemolytic crisis without anemia proven by elevated reticulocytes, elevated unconjugated bilirubin and normal hemoglobin and erythrocyte ...
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646 views

Is it possible to have an autoimmune disease and no C-reactive protein in blood serum?

Autoimmune diseases cause inflammations. C-reactive protein should be elevated in a person with an inflammation. Is it possible that a person with an autoimmune disease (e. g. autoimmune hemolytic ...
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176 views

What are the likeliest causes for rising indirect bilirubin levels?

All the following data is from a task a professor gave me and is not connected to a true patient. Patient's bilirubin level is first 28 micromole/litre and direct bilirubin level is 8 micromole/litre. ...
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29 views

Could NSAIDs lift bilirubin level?

If one takes 800 to 1200 mg of ibuprofen a day for 3 to 4 weeks, could that lift total bilirubin level to around 28 micromole/litre and direct bilirubin to around 8 micromole/litre?
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20 views

What are the differential diagnoses of increased ferritin?

What are the possible causes of increased ferritin in a 69 year old man who is otherwise normal and who is not anemic?
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40 views

Why do Vacutainer blood containers contain additives? Are they really necessary and have an effect on blood analysis? [closed]

Just a basic medical science question. Is a vacutainer necessary for use in venous whole blood sample collection? Also is the needle with plastic holder required? Can we not draw blood using a sterile ...
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66 views

How else can a phlebotomist lessen my pain, on top of using a baby needle? [closed]

My grandpa's specialist has ordered quarterly blood tests for him. Most of LifeLabs' phlebotomists (in Ontario, Canada) venipuncture very painfully. Though he didn't mention algophobia, he chanced ...
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103 views

Why is prothrombin time not used to monitor the effects of heparin?

Unfractionated heparin (UFH) is an anticoagulant that main works "by inactivating thrombin and activated factor X (factor Xa) through an antithrombin (AT)-dependent mechanism". Prothrombin time (PT) ...
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235 views

What blood tests are worth doing for a healthy 30-year-old male?

The patient is a 30-year-old male who seems healthy. The patient has to do a blood test for some administrative forms (namely, proof of immunity to rubella and varicella), and wonder what else could ...
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18 views

Why are there different blood sugar measurements?

I've been reading about health and wondering why blood sugar measurements are different. Why do these different sites use different measurements and give different numbers? Examples: Less than 100 ...
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78 views

Does mastectomy permanently prevent using the arms for blood samples?

This question, Why can't blood samples be taken from the legs/ankles as well arms/wrists? , refers to Specimen Collection Procedure - PERFORMING A VENIPUNCTURE | Akron Children's Hospital, which says: ...
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2k views

Why can't blood samples be taken from the legs/ankles as well arms/wrists?

This is a genuine question, which so far I've been unable to find an answer to. Some time ago when my wife was pregnant, she seemed to be constantly needing to have samples taken for various tests ...
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1answer
71 views

How reliable is the determination method of reference ranges for blood tests?

A reference range is usually defined as the set of values 95 percent of the normal population falls within (that is, 95% prediction interval). It is determined by collecting data from vast numbers ...
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152 views

What is the blood level evolution of a intramuscular injection?

Suppose an intramuscular injection of a substance is done on a patient. What would be the form of the graph of the blood concentration of this substance over time?
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42 views

Can the foods you have been eating be detected through blood tests?

I know that things like sodium, cholesterol, and sugar levels can be found in blood (at least I think so.) But what about things like fruits and veggies? Can that be detected through bloodwork? Or ...
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343 views

Difference between mmol/l and mg/dl for blood glucose measurement

I'm in the process of preparing a short lecture on hypoglycemia. In the process, I discovered that blood glucose levels can be expressed in the measurement of millimoles per liter or milligrams per ...
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29 views

What does a low serum creatinine indicate?

The normal serum creatinine range is [0.80-1.60] mg/dl. If a person's creatinine level is slightly less than 0.80 mg/dl, what does it indicate?
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1k views

Risk of HIV transmission during blood test?

If I as an healthy individual get my blood work done for preventative reasons (health checkup etc...) at mass testing labs (Labcorp) or smaller local internal medicine practices - what are the chances ...
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38 views

High lyphocytes count in blood test

What is the lymphocytes counts limit which discriminates a recent infection from a CLL (Chronical Leukaemia Lymphocytosis)?
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7k views

Fasting blood glucose and Hemoglobin A1C not valid for athletes?

I've been a competing athlete, mostly in endurance sports for nearly 45 years now. As part of military and other physicals, I have had blood glucose levels come back several times with high levels, ...
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45 views

What metric is used to measure estrogen levels?

I have had a blood test recently and over the phone I was told by a doctorthat my oestrogen level is high. I'm a man and was told my level is "190, but the average is 150". 190 what? I forgot to ask ...
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240 views

Baby vs. Butterfly Needle

How do they differ? They're mentioned here. I prefer a smaller needle to lessen pain for blood tests.
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1answer
136 views

Are there any other probabilities for an O blood typed kid other than O & O parents?

I was watching a Ted-Ed video about blood types. It said that an O kid is only possible for O & O parents. I want to make sure of that fact, and to know whether it's related to only and ...
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61 views

Hormone Definitions and Measurements [closed]

How are human hormones defined in the body and how are they measured? I understand that blood tests can be used to measure the amount of a hormone in the body, but how do we know which hormone ...
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7k views

How long should a person keep blood test results?

If someone has no chronic health problems (but a family history of diabetes and high blood pressure), is there a good medical reason for them to keep their old blood test results that doctors have ...
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52 views

Can a minor burn influence blood/fecal test results?

If a person sustained a minor burn on their hand from touching a hot object (2-3 hours after the burn there is only some red skin and little pain), and is meant to do blood and fecal tests in the ...
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4k views

Which lab value skeleton diagrams are used to display results for CBC, Chemistry, coagulation panel, etc?

Which lab value skeleton diagrams are used for discrete, cbc/cbcdiff, chem, and coag results?
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461 views

Why lower gauge needles aren't used to draw blood for blood tests?

I am told that lower gauge needles (broader needles) are used during blood donation to minimize the damage to the RBCs. If the probability of damaging the drawn RBCs is greater with Higher gauge ...
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1answer
42 views

What are the factors that make veins easy for a blood test one day, and difficult the next?

I take blood tests quite frequently, and most the time the technicians (Phlebotomists) spend a lot of time searching both my arms for a good vein. I pump my fists, and they smack my arms (and of ...
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48 views

Does Blood Testing give meaningful insights in Vitamin/Mineral Deficiency?

I yesterday watched the documentary Vitamania by Dr Derek Muller, which is about the production, benefits and risks of vitamin supplements. In the film, he briefly talked about people being blood ...
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1answer
76 views

What software are there to use on laptop for blood analysis and diagnosis?

I wanted to know if there are any softwares that by installing on a notebook can allow me to do initial diagnosis of a patient at ordinary locations. Does anybody know what softwares are there or ...
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1answer
53 views

Are medical units pertaining to blood-tests, etc. standard/universal? Or vary from country to country?

Are medical measurements/units pertaining to blood-tests and urine-tests standardized across the globe? Or are they different? (I thought the metric system was standard in science, but when I was ...
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1answer
484 views

Are metamyelocytes typically present on blood tests?

Is it normal to have metamyelocytes present on a blood test result? Basically, does it adhere to the standard morphology of the WBC & platelet or is it indicative of something abnormal?
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35 views

What approaches can I take to find out my blood type and Rhesus factor?

I need to find out my blood type and Rhesus factor. However, there is no medical necessity for this - it's just to know myself. (as such, I'm aware that medical insurance would likely not cover the ...