If a doctor says he checked everything in a blood test, what does that mean?

One of my relatives had a blood test, and the doctor said he checked everything and everything is fine. Does she really check through EVERYTHING? Including Hepatitis B, C, aids and other diseases like that?

A blood test normally covers glucose (sugar) level for possible diabetes, cholesterol level, triglyceride level, possible prostate problems for males, some electrolyte levels such as potassium and sodium and a few other possible health problems but there is no way it can cover everything such as arthritis, other bone problems, Alzheimer's disease, epilepsy, brain problems, kidney problems, heart problems and other possible problems that require testing other than a blood test.

X-rays and urine tests, for example, can detect health problems that are not covered by a blood test so the doctor is exaggerating when he says that a blood test covers everything.

no. those are "specialty" tests and you probably had the "routine" tests which turned out "all normal". medicine is very confusing, but she probably did the blood tests that screen for the most likely diseases that you could have. if these are normal, then there's a very good chance you are going to feel better after a while - maybe you had the flu, a cold, a "stomach virus" or some other non-treatable, self-limited entity. however, if the problem that you have becomes recurrent or persists, then the doctors have to reach deeper into their "grab-bag" of tests and start looking at those. but, by no means does "everything" mean everything, it just means of all the tests you had done, everything was normal.

This is a good question, and it really depends on the specific tests the doctor had the laboratory run with the blood sample. Basic labwork would include a complete blood count (red cells, white cells, platelet count, etc.) and then often a chemistry panel (sodium, potassium, chloride, glucose, basic kidney and liver functions, etc). To test for things like Hepatitis A, B, or C the doc has to note those tests specifically. Unless your relative expressed they were concerned about those health problems, or the relative had liver function tests which were high, and the doc wanted to see if Hepatitis could be the problem, chances are they'd not be run routinely. AIDs testing requires a special form to be signed (here in California anyhow..) so the patient knows that test is run. Now if your relative expressed to the doctor they were worried about sexually transmitted diseases...from either a possible exposure directly with another person with whom they were sexually active (or they were worried about having been with a partner who wasn't faithful to the relationship), then yes, those tests would be run, and some other STDs as well. I hope this helps.

all tests do get done including hep b and c. test for stds like aids are only done if it is discovered thet the patient lives a high risk life. otherwise they dont

I'm pretty sure she just checked the blood and found nothing abnormal with it.

It means the doctor done all the tests he require and he had a doubt.