Later models of flame photometer uses_____ as an internal standard that allows the operator to measure sodium, potassium and lithium directly.

When measuring potassium using an ion selective electrode, the membrane is composed of:

Which electrolytes are elevated in cystic fibrosis?

In the blood, bicarbonate leaves the red blood cell and enters the plasma through an exchange mechanism with:

It is an essential component of the glucose tolerance factor, thought to play a role in maintaining normal insulin response to glucose load by affecting membrane response to insulin:

Increased chloride levels as determined by colorimetric and ion-selective electrode methods may be caused by the presence in the solution of:

Which of the following is the primary mechanism causing respiratory alkalosis?

If a blood gas specimen is left exposed to the air for an extended period of time, which of the following changes will occur?

Sealed heparinized arterial blood was left at room temperature for 2 hours. The most likely changes in PO₂ (mmHg), PCO₂(mm Hg), and pH, respectively, are:

The adrenal medulla secretes which of the following in the greatest quantity?

Homovanillic acid is the principal urine metabolite of:

Diurnal variation is important to consider when collecting blood for the assay of:

T3 uptake is actually a measurement of:

Active hormonal form of T₃ an T_4:

The principle is based on the reaction of urinary estrogen with a mixture of phenol and sulfuric acid to produce pink color. This refers to:

The Kober reaction is used in the assay of:

In the Porter-Silber assay, the dihydroxyacetone side chain of the steroid hormone reacts with:

The assay employed for 17-ketosteroids, in which steroids react with m-dinitrobenzene in alcoholic KOH solution resulting to the formation of a purple color:

Zollinger-Ellison syndrome is characterized by elevated blood levels of:

Tumor marker most useful in the detection of familial medullary carcinoma of the thyroid:

What metal toxin in urine is detected by the Reinsch test?

Trinder’s reagent (mercuric chloride, HCl, and ferric nitrate) is used in the colometric assay for:

Caffeine is an important metabolite of this drug, which is assayed in newborns and young children to monitor its therapeutic level. What is this?

Odor of bitter almond gives a clue of:

Benzoylecgonine is the major metabolite of:

The formation of this crystal in urine, although not a constant finding is an important diagnostic clue of ethylene glycol poisoning:

What is the major carrier of drugs in the circulation?

Fire extinguishers designated as Class A are used for:

It is a specialized colorimeter designed to scan and quantitate electrophoresis patterns:

The element that distinguishes proteins from carbohydrate and lipid compounds is:

Parfentjev’s method is for the determination of:

Apolipoprotein A is the primary protein component of:

It is biologically important, as it serves as the starting point in many metabolic pathways including Vitamin D synthesis, steroid hormone synthesis, and bile acid metabolism.

What is the current reference method for cholesterol analysis?

A mild condition that appears to result from a genetic defect in transport of bilirubin from sinusoidal blood into the hepatocyte:

What reagent is used in the Evelyn-Malloy method to dissociate the unconjugated bilirubin from protein?

The Jaffe reaction is employed for the quantitation of:

Lloyd’s reagent improves the specificity of what colorimetric method of determination?

What is the major end product of protein and amino acid catabolism?

Uric acid when oxidized by the enzyme uricase is transformed to:

The sweat chloride test is useful in the diagnosis of:

Which trace metal accumulates in Wilson’s disease?

The pH of blood is critically maintained at what level:

In which of the following are the thyroid hormones classified:

Which of the following polypeptide hormones may be described as having alpha chains that are biochemically identical but beta chains that are biochemically unique?

The thyroid gland produces all of the following hormones EXCEPT:

In hypothyroidism, one would expect the total T4 level to be _____, and the T3 uptake to be ____.

How can primary hypothyroidism be differentiated from secondary hypothyroidism?

5-Hydroxyindoleacetic acid is the primary metabolite of: