Questions tagged [blood-tests]

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

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12
votes
2answers
6k 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 ...
11
votes
3answers
6k 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, ...
11
votes
1answer
390 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 ...
10
votes
1answer
1k views

I have natural immunity to Hepatitis B. Do I pose risk to others?

Some time ago I was rejected as donor and received following rejection letter: Just wanted to inform you that there was a positive infectious disease result for Hepatitis B. Unfortunately, we ...
10
votes
2answers
251 views

How to detect cancer in general?

Can a common blood test spot cancer in general? Or is it necessary to take some specific tests for each kind of cancer?
9
votes
1answer
287 views

What causes elevated liver function tests in a young asymptomatic patient?

What are the possible causes and most probable causes of raised liver function tests (in particular AST and ALT) in an otherwise healthy, asymptomatic, young adult?
8
votes
2answers
3k views

How does ones TSH tend to vary over the course of a day?

A single TSH (Thyroid Stimulating Hormone) blood test is commonly used to help diagnose thyroid problems, however my understanding is that the TSH tends to vary substantially over the course of a day, ...
8
votes
2answers
228 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 ...
8
votes
1answer
60 views

Low dose and high dose dexamethason supression test

What is the difference between high dose and low dose dexamethason suppression test in Cushing Syndrome diagnosis?
8
votes
1answer
106 views

How to find a good (or appropriate) doctor

General case What is the strategy you use to find a good / appropriate doctor? The current ones I know are: Randomness Mouth to mouth Reading online reviews Randomness gives... random results. ...
7
votes
2answers
232 views

How accurate is testing for HSV-2?

I've never had any symptoms of a Herpes simplex virus 2 infection. However, I want to find out if I carry this type of virus in my body. Is it true that there is an antibody test to answer that ...
6
votes
2answers
133 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 ...
6
votes
1answer
344 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 ...
6
votes
1answer
64 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 ...
6
votes
1answer
80 views

Which of these things is needed for a first time pregnancy checkup?

My wife and I are now expecting our first child. She is 4 weeks and 7 days at the time of writing this. We are both under 30. I currently live in Dubai where I am British Expat and medical costing is ...
6
votes
2answers
878 views

Why should I fast before taking blood tests?

This always puzzled me. Not only because it is a nuisance, but also because I cannot understand it. Whenever I have to take a blood sample to run some tests on it, I am always told not to eat ...
6
votes
0answers
120 views

Does the “Dawn Phenomenon” of blood sugar apply to non-diabetics?

I bought myself a $15 blood sugar testing kit the other day because I've been experiencing some health things that are rare for me such as migraines (I rarely have had headaches my entire life) and a ...
5
votes
1answer
95 views

Puncturing a vein vs. an artery

I was recently with my grandmother at the Emergency Department because she had difficulty breathing. After the clinical examination by a doctor, she received both an artery and a vein puncture. Why ...
5
votes
1answer
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 ...
5
votes
1answer
192 views

What do these blood tests mean in general and why do doctors ask for them before taking action?

My doctor ordered some blood tests for me. I would like to understand what each test is for, meaning what information could be gathered from the results. W.B.C. Platelets E.S.R. C.R.P. Alpha feto ...
5
votes
1answer
62 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: ...
5
votes
1answer
155 views

High level of Vitamin D,1,25(OH)2, Total

I recently got blood test results and they say Normal Range, High level of Vitamin D,1,25(OH)2, Total = 18 - 72 pg/mL but my level is 96 I was researching this and found that it can be due to ...
5
votes
1answer
145 views

What are the natural and healthy ways to increase blood sugar?

Some relatives of mine have low blood sugar. Doctor told them to eat table sugar whenever they get a feel of low blood sugar. AFAIK table sugar is not good for health. What are the natural and ...
5
votes
1answer
93 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 ...
5
votes
1answer
80 views

Routine exams in patients with hypothyroidism

In people with hypothyroidism that is being treated with thyroid hormones and that are not showing symptoms or hypothyroidism, how often should these tests be performed: TSH blood test T4 blood test ...
5
votes
1answer
66 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) ...
5
votes
1answer
280 views

ABO blood type mismatch

I have a question about blood types and seeming hereditary contradictions. The above image of an Eldoncard blood test, which shows quite clearly that the testee has AB- type blood. (see image!). The ...
5
votes
1answer
481 views

Understanding the difference between IgG and IgE results

The following results are an example of an independent blood test and the differences between IgE and IgG. The bars in black are examples of IgE and those in grey IgG. If i use the example of ...
4
votes
1answer
51 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 ...
4
votes
1answer
78 views

What are the online blood testing services that allow to pick and choose exactly what test you want?

I know there are now several competitive online blood test companies that offer a menu of bundled blood test services in the US. I am looking for a US based service that would disaggregate their ...
4
votes
1answer
218 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?
4
votes
1answer
3k views

When to take a blood test after a gout attack

Gout is caused by an elevated level of uric acid in the blood, which results in crystals forming in the joints. Once this reaches a critical level, the body responds by targeting the crystals, ...
4
votes
1answer
171 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. ...
4
votes
2answers
271 views

What CGM systems don't require fingerstick calibration?

Most continuous glucose monitoring (CGM) systems require you to still do fingerstick blood testing on a daily basis in order to calibrate them. But that defeats the purpose of why people want CGM ...
4
votes
1answer
57 views

Do Western Blot 'false negatives' eventually produce positives?

I've heard again and again that the Western Blot test, used to detect the presence of Lyme Disease, often produces false negatives. But I would suspect that at some point, whatever it is that Lyme ...
4
votes
1answer
60 views

What is the point in checking non-fasting glycemia?

I wonder what the point is in measuring the glucose level in a non-fasting blood test. Example (real case): Checking the fasting glycemia can amongst other things detect the presence of diabetes, ...
4
votes
1answer
41 views

Who decides the “normal” values for blood count?

I'm currently researching the values for a Complete Blood Count. Obviously different sources give slightly different values, usually due to rounding, but I found that some values consistently shifted ...
4
votes
1answer
2k views

How many mL of blood is typically drawn for a HIV blood test?

I hope this isn't too broad or unanswerable a question but I'm wondering how many mL of blood serum are typically drawn out for a blood test for HIV. What's the minimum that's typically required?
4
votes
0answers
47 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 ...
4
votes
0answers
83 views

Can GFR be improved in patients with kidney failure?

How widely can glomerular filtration rate (GFR) values fluctuate and can they ever improve? How much "error" might one expect in the value if sampled quarterly?
4
votes
0answers
48 views

Is it worth testing regularly for oxidative stress?

I have read that oxidative stress is associated with neurodegenerative diseases, cardiovascular disease, ageing, cancer, and diabetes. Popular health 'buzz' would suggest consuming antioxidant ...
3
votes
2answers
727 views

Possible blood test after smoking weed

I'm going to a medical consultation early tomorrow (circa 5:45 AM) where might be a blood test. I was invited for a party tonight where I would drink and smoke marijuana (marijuana is illegal in my ...
3
votes
1answer
452 views

Lab test result meaning

Why in this lab test results the microsomal antibodies amount has less sign and thireoglobulin antibodies don't have this sign? I did not question it first but now I have suspicion may be I am not ...
3
votes
2answers
66 views

Is there any test to identify bacteria?

When I got some upper respiratory infection the doctor always prescribed broad-spectrum antibiotics like amoxicillin. Is there any test to identify bacteria, and if so, why doesn't the doctor order ...
3
votes
1answer
51 views

Why is blood glucose measured using molar concentration internationally?

In the US, blood glucose is measured in mg/dL, while the rest of the world tends to use mmol/L. Is there any reason for using the molar concentration rather than the mass concentration? Or is it just ...
2
votes
1answer
91 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
1answer
135 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
1answer
33 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 ...
2
votes
2answers
63 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 ...
2
votes
1answer
3k views

Reason behind testing blood when someone is suffering from Common cold and fever?

What does testing blood helps identifying in case of Common cold or fever? This article about Common cold states, a doctor may do a throat or nasal culture, or blood test to rule out a secondary ...