Pregnancy and Fetal Testing

There are specific markers that correlate to normal or abnormal fetal health that are important to know. Its also important to understand the normal course of a pregnancy and also the normal circadian rhythm of hormones that are involved in ovulation and a womens' menstrual cycle. Both the anterior pituitary and ovaries are involved in … Continue reading Pregnancy and Fetal Testing

The Pseudohyponatremia Debacle

Measurement of electrolytes in a sample of plasma is probably one of the most common tests that is performed. Every patient who gets blood drawn will also get a Chem 7 or CP13 which will include an analysis of electrolytes. There are two different technological approaches to measuring electrolytes, depending on what kind of chemistry … Continue reading The Pseudohyponatremia Debacle

Laboratory Equation Guide

SI Units: The International System of Units is a system devised around the convenience of the number ten. It is the worlds most widely used system of measurement in science. Temperature SI Standard units are Kelvin (K) Celsius = K-273 Kelvin = Celsius+273 Temperature Conversions Celsius = 5/9 (F - 32) Fahrenheit = (9/5 x … Continue reading Laboratory Equation Guide

Renin-Angiotensin-Aldosterone System

The renin-angiotensin-aldosterone system (RAAS) plays a physiological role in regulating blood volume and systemic vascular resistance. The two together have an influence on cardiac output and arterial blood pressure. There are three important components to the RAAS; renin, angiotensin, and aldosterone. Stimulation of renin from the juxtaglomerular cells (JG) is stimulated by sympathetic nerve activation … Continue reading Renin-Angiotensin-Aldosterone System

Biotin Interference on Diagnostic Testing

Biotin, also known as vitamin B7 is a coenzyme that is involved in carbon dioxide transfer in carboxylase reactions. The USDA recommended dietary reference intake for biotin is 30 ug per day which should mostly come from food. The last few years biotin has been marketed heavily as a beauty supplement. It is used in … Continue reading Biotin Interference on Diagnostic Testing