Understanding Your Cholesterol (Lipid Panel) Test: What to Expect, Why It's Done, and How Results Guide Your Heart Health
A blood test that measures the acidity or alkalinity of your body fluids, specifically serum, to evaluate your acid-base balance.
{"The pH test measures how acidic or alkaline your blood is (normal: 7.35-7.45)","Abnormal results may indicate kidney, lung, or metabolic disorders","The test uses a blood sample drawn from a vein in your arm","No special preparation is typically needed, but follow your doctor's instructions","Results help doctors diagnose conditions like acidosis or alkalosis"}
Key facts at a glance
- LOINC
- 2748-2
- Short code
- pH
- Synonyms
- pH Fld
- Category
- chemistry
- Sample
- serum
- Container
- Serum separator tube (SST/gold top) or plain red top tube; arterial blood gas syringe for arterial samples
- Units
- not specified
- Ref low
- 7.35
- Ref high
- 7.45
- Critical range
- 7.2 not specified – 7.6 not specified
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- Electrochemical (Ion-Selective Electrode)
- CPT
- 82803
- SNOMED
- 271060006
- Specimen volume
- 1-2 mL serum minimum
- Stability
- Analyze immediately; stable at room temperature for up to 30 minutes. Place on ice if delay >10 minutes. Do not refrigerate as cold inhibits glycolysis and may alter pH.
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 1–4 hours
- Order
- routine
This test measures the levels of different types of cholesterol and fats (lipids) in your blood, including total cholesterol, LDL (bad) cholesterol, HDL (good) cholesterol, and triglycerides. High levels of certain lipids can raise your risk of heart disease and stroke, so this test helps you and your doctor assess your overall cardiovascular risk and decide if lifestyle changes or medications are needed.
The pH of Body Fluid test measures the concentration of hydrogen ions in your serum (the liquid part of your blood). This test is crucial for assessing your body's acid-base balance, which is tightly regulated by your lungs, kidneys, and buffer systems. The pH scale ranges from 0 to 14, with 7 being neutral. Your blood should normally be slightly alkaline, with a pH between 7.35 and 7.45.
The test is a simple blood draw. A healthcare professional will clean a small area of your arm, place a tight band around your upper arm to make your veins more visible, and insert a fine needle into a vein to collect a small sample of blood into a vial. You may feel a brief sting or pinch when the needle goes in, but the entire procedure lasts only a few minutes, and you can usually resume normal activities right away.
A healthcare professional will draw a small blood sample from a vein in your arm using a needle. The sample is then placed in a special tube and sent to a laboratory for analysis. The test measures the hydrogen ion concentration in your serum, which indicates whether your blood is too acidic (low pH) or too alkaline (high pH).
Your doctor may recommend this test to evaluate your risk of developing heart disease, especially if you have risk factors such as high blood pressure, diabetes, a family history of early heart attacks, or if you smoke. It is also useful for monitoring how well your treatment is working, including whether diet, exercise, or cholesterol-lowering medications like statins are effectively reducing your lipid levels. Regular testing can help you prevent serious cardiovascular events like heart attacks or strokes.
Your doctor may order this test if you have symptoms of an acid-base imbalance, such as difficulty breathing, confusion, nausea, or fatigue. It is also commonly used to monitor patients with kidney disease, diabetes, lung conditions, or those who are critically ill. The test helps doctors determine if your body is maintaining proper pH levels and identify the cause if abnormalities are found.
Reference range
7.35-7.45not specified
No special preparation required; specimen collected by clinician
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Abnormal serum pH values can indicate various medical conditions. Low pH (acidosis) may result from diabetic ketoacidosis, lactic acidosis, kidney failure, severe diarrhea, or breathing problems. High pH (alkalosis) can be caused by prolonged vomiting, diuretic use, hyperventilation, or certain hormonal disorders. The pH test is often performed alongside other tests like bicarbonate (CO2), electrolytes, and blood gases to get a complete picture of your acid-base status and guide appropriate treatment.
Frequently asked questions
Do I need to fast before the test?
What is the normal pH range for blood?
Is the test painful?
How long does it take to get results?
Sources
- 1MedlinePlus - Blood pHSource
- 2
- 3ARUP Consult - pHSource
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy