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Questions tagged [blood-tests]

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

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26 votes
1 answer
6k views

Why are iron levels different in the left and right hands?

Yesterday I donated blood. When the nurse performed a finger prick test of iron using my left hand, she indicated that the level was too low. However, she then asked to perform the test again on my ...
2 votes
2 answers
112 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 ...
8 votes
1 answer
3k views

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

Autoimmune diseases cause inflammation. C-reactive protein (CRP) should be elevated in a person with inflammation. Is it possible that a person with an autoimmune disease (e.g. autoimmune hemolytic ...
0 votes
1 answer
83 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, ...
5 votes
0 answers
5k views

What causes air bubbles/air glugs when getting blood drawn with a vacutainer system?

As I understand it, the vacutainer system used in modern phlebotomy should never result in air bubbles “glugging” into the vacutainer tube when blood is drawn from a patient. However, today I learned ...
2 votes
0 answers
51 views

The technological limitation of information extraction from a drop of blood

In light of the sentencing of Elizabeth Holmes just now, I would like to ask if there is a technological limitation for extracting the full spectrum of test information from a drop of blood. This ...
0 votes
1 answer
104 views

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

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 ...
1 vote
0 answers
27 views

What is the principle behind PCR/NAAT test, in the context of HIV, especially compared to antigen/antibody test?

So here's my limited understanding of how viral infections work. Some virus enters the body and causes an infection. The virus then begins to replicate itself. It takes some time for there to be ...
3 votes
1 answer
556 views

Can superficial injury and exercise elevate AST and LDH levels?

Reading the information available here and here, it's stated that both exercise and other injuries can cause elevated results on a couple of indicators commonly used to measure liver function. ...
2 votes
0 answers
959 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 ...
2 votes
1 answer
64 views

Meaning of "lower limit of normal + 20% over basal value" in a description of a blood lactate analysis (after glucose load)

From "Alpers- and MNGIE-like disease with disturbed CSF folate transport and an unusual mode of genetic transmission of POLG mutations: a case report": Basal serum lactate was normal (1.1–1....
1 vote
0 answers
32 views

Multiple blood-type results [closed]

What would be the reason for multiple blood-type results for one person? All taken from 2 hospitals (best hospitals in the state), doctor's offices, blood donations. Blood drawn after birth (written ...
3 votes
1 answer
91 views

Can false positives/negatives be reliably detected by redoing the test?

As the title states, I'm wondering whether simply redoing a test is a valid means of eliminating the risk of a given result being false. The question is specifically about repeating the same exact ...
5 votes
0 answers
65 views

Blood tests for borrelia and their informative value

Disclaimer: I am here as a highly medically interested person looking for an explanation of an observed phenomenon, not for medical advice, as it is not about my person. I work in a diagnostic ...
0 votes
0 answers
30 views

What are the basic reasons for normogonadotropic hypogonadism?

I'm can't fine the full known scope of reasons of male normogonadotropic hypogonadism. From this article I see the two basic reasons: Gonadal dysgenesis variants (residually functioning ovarian ...
1 vote
0 answers
22 views

Can the HS-Omega-3 Index be calculated from EPA and DHA?

I want to test my levels of Omega 3s, and I'm curious if it makes sense to test both the HS-Omega-3 Index and the EPA (Eicosapentaenoic Acid) & DHA (Docosahexaenoic Acid), or just the latter? ...
2 votes
0 answers
33 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), ...
1 vote
1 answer
167 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 ...
0 votes
1 answer
77 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 ...
11 votes
1 answer
463 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 ...
5 votes
1 answer
4k 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 ...
2 votes
0 answers
32 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 ...
1 vote
0 answers
29 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 ...
1 vote
0 answers
23 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 ...
0 votes
1 answer
30 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 ...
1 vote
1 answer
58 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/...
1 vote
0 answers
38 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 ?
2 votes
0 answers
24 views

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 ...
2 votes
0 answers
112 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 ...
4 votes
1 answer
287 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. ...
0 votes
0 answers
37 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?
2 votes
0 answers
21 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?
0 votes
2 answers
73 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 ...
2 votes
2 answers
80 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 ...
7 votes
1 answer
192 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) ...
8 votes
2 answers
266 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 ...
2 votes
0 answers
29 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 ...
5 votes
1 answer
2k 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: ...
6 votes
1 answer
5k 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 ...
6 votes
1 answer
109 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 ...
2 votes
1 answer
297 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?
2 votes
1 answer
102 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 ...
0 votes
0 answers
38 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?
0 votes
1 answer
3k 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 ...
1 vote
0 answers
45 views

High lyphocytes count in blood test

What is the lymphocytes counts limit which discriminates a recent infection from a CLL (Chronical Leukaemia Lymphocytosis)?
12 votes
3 answers
10k 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, ...
2 votes
0 answers
78 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 ...
1 vote
1 answer
354 views

Baby vs. Butterfly Needle

How do they differ? They're mentioned here. I prefer a smaller needle to lessen pain for blood tests.
2 votes
1 answer
143 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 ...
2 votes
0 answers
67 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 ...