A blood test is the cheapest way to catch a problem before it gives you symptoms. Diabetes, high cholesterol and anemia build up quietly for years: they show up in lab work long before you feel unwell. This guide explains what each test measures, when you need to fast and what to ask when you get your results.
When is a blood test worth doing?
There are three clear reasons. The first is a routine checkup, especially if you are over 35, if diabetes or heart disease runs in your family, or if it has been years since you saw a doctor. The second is following a condition you already have: anyone living with diabetes needs their A1C checked several times a year. The third is paperwork: immigration, employment or school exams that require specific tests.
The CDC estimates that about one in five U.S. adults with diabetes does not know they have it. A five-minute blood draw answers that question.
What each test measures
- Complete blood count (CBC): red cells, white cells and platelets. This is the test that finds anemia, which we see often in Pasadena among young women with heavy periods and in people with poor diets.
- Comprehensive metabolic panel: glucose, kidney and liver function, electrolytes. The general picture of how your body is running.
- Hemoglobin A1C: your average blood sugar over the past two or three months. It does not depend on what you ate yesterday, so it is more honest than a single glucose reading.
- Lipid panel: total cholesterol, LDL, HDL and triglycerides.
- Thyroid panel (TSH): the one that explains fatigue, hair loss, feeling cold all the time or weight changes with no clear reason.
- Vitamin B12: a deficiency causes fatigue, tingling in hands and feet and trouble concentrating. If yours is low, we give the vitamin B12 injection right here. You can also ask about the blood panel plus B12 promotion.
Do I have to fast?
It depends on the test. Fasting glucose and the lipid panel call for 8 to 12 hours without food, according to MedlinePlus, from the National Institutes of Health. A1C, the CBC and the thyroid panel need no fasting.
Two things that help and almost nobody knows: you can drink water while fasting, and you should, because a hydrated vein makes the draw easier. And if you take daily medication, ask before skipping it: in most cases you take it as usual.
The practical move is to come in fasting in the morning. We open at 9 AM every day.
How to read your results
Every lab prints a reference range next to your number. Being one point outside that range does not mean you are sick, and being inside it does not always mean everything is fine: a "normal" cholesterol can still be high for someone who has already had a heart attack.
So when we hand you your results, ask three things: what the out-of-range value means, whether the test should be repeated and what the next step is. We explain it in Spanish, without jargon, and if the result calls for treatment, we start during the same visit.
Walk in, no appointment
At Clínica Hispana Nueva Salud Michoacana we draw your sample on the spot, with no appointment and no insurance. We are at 6500 Spencer Hwy Ste 180 in Pasadena. Call us at (832) 617-7439 or visit Monday to Saturday from 9 AM to 9 PM and Sunday from 9 AM to 7 PM.