What a 10 Parameter Dipstick Measures

The standard urine dipstick has ten reagent pads. Each pad holds a dry chemical that changes color when it meets a specific substance in urine. You dip the strip, wait, and match each pad to a color chart. Clinics have used this format for decades. The home versions are the same chemistry in a retail bottle.

Here is what each pad does, in the order they usually appear on the strip.

Glucose

Normal: negative.

The pad detects sugar in urine. Glucose normally stays in the blood. It shows up in urine when blood sugar is high enough that the kidneys cannot reabsorb it all, typically above 180 mg/dL. A positive result is a reason to check blood sugar, not a diagnosis of diabetes. Vitamin C in high doses can cause a false negative.

Bilirubin

Normal: negative.

Bilirubin is a product of red blood cell breakdown. It belongs in bile, not urine. When it appears, the usual cause is a liver or bile duct problem. The pad is sensitive to light, so a strip left in the open degrades fast. A positive here should go to a clinician.

Ketones

Normal: negative.

The pad reacts with acetoacetate, one of three ketone bodies. Ketones appear when the body burns fat for fuel instead of glucose. Fasting, a low carbohydrate diet, vomiting, and uncontrolled diabetes all raise them. The pad does not detect beta hydroxybutyrate, which is the dominant ketone in long term ketosis. That is why the strips fade in usefulness for people on a ketogenic diet. See the ketone strips guide.

Specific gravity

Normal: 1.005 to 1.030.

This measures how concentrated the urine is. Low numbers mean dilute urine, from drinking a lot or from kidneys that cannot concentrate. High numbers mean concentrated urine, usually from dehydration. Specific gravity also tells you how much to trust the other pads. Very dilute urine can push a real finding below the detection threshold.

Blood

Normal: negative.

The pad detects hemoglobin. It cannot tell the difference between intact red cells, free hemoglobin, and myoglobin from muscle breakdown. Menstrual contamination is the most common cause of a false positive. Hard exercise can cause a real but harmless positive. Persistent blood with no obvious cause needs a workup.

pH

Normal: 4.5 to 8.0, most often around 6.

Urine pH swings with diet. A high protein diet pushes it acidic. A plant heavy diet pushes it alkaline. A pH above 8 can point to a urinary infection with a urease producing organism. It can also mean the sample sat too long before testing. Always test fresh urine.

Protein

Normal: negative or trace.

The pad is most sensitive to albumin. Small amounts, called trace, are common after exercise, fever, or standing for long periods. Persistent protein at 1+ or higher is the classic sign of kidney damage. The pad misses low level albumin leakage, which is why kidney monitoring uses a separate microalbumin test. See the kidney tests guide.

Urobilinogen

Normal: 0.2 to 1.0 mg/dL.

Urobilinogen forms in the gut from bilirubin and a small amount always circulates. High levels can point to liver disease or rapid red cell breakdown. A result of zero is also abnormal and can mean a blocked bile duct. Most home users can ignore this pad unless bilirubin is also positive.

Nitrite

Normal: negative.

Many bacteria that cause urinary infections convert dietary nitrate into nitrite. A positive pad means those bacteria are present in meaningful numbers. The test needs urine that has sat in the bladder for about four hours, so first morning urine gives the best result. Some common infection organisms do not produce nitrite. A negative pad does not rule out infection.

Leukocyte esterase

Normal: negative.

This pad detects an enzyme released by white blood cells. White cells in urine mean inflammation, usually from infection. This pad takes the longest to develop, often 60 to 120 seconds. Reading it early gives a false negative. Vaginal secretions can cause a false positive. Together with nitrite, it is the basis of home UTI tests. See the home UTI test guide.

The read window

Each pad has its own read time, printed on the bottle. Glucose and bilirubin are usually 30 seconds. Ketones, specific gravity, blood, pH, protein, urobilinogen, and nitrite are usually 60 seconds. Leukocytes are usually 120 seconds. Colors keep changing after the window closes. A strip read at three minutes is wrong on most pads. Use a timer.

Things that skew the whole strip

• Vitamin C at supplement doses can cause false negatives on glucose, blood, nitrite, and bilirubin.
• Some dyes and drugs turn urine a color that hides the pad reaction. Phenazopyridine, the common UTI pain reliever, is the usual offender.
• Dilute urine lowers every reading. Test first morning urine when you can.
• A wet or expired strip gives weak colors across the board.

Should you buy a 10 parameter strip

If you want a general picture, yes. It is the cheapest way to look at ten things at once. If you have one specific question, a focused kit is usually easier to read and harder to get wrong. Our buyer guide walks through the choice.