Lab Values and Concentrations

Introduction to lab values and normal ranges

Find out how health professionals use short-hand for labs and the meaning of normal ranges. Rishi is a pediatric infectious disease physician and works at Khan Academy.

What's Inside of Blood?

Spin down your blood and find out what it's made up of. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Units for common medical lab values

Figure out how to interpret the units in common medical labs including the CBC, Chem 10, and LFTs. Rishi is a pediatric infectious disease physician and works at Khan Academy.

What is an equivalent?

Figure out how to calculate an equivalent and how it relates to a mole. Rishi is a pediatric infectious disease physician and works at Khan Academy.

The Mole and Avogadro's Number

Introduction to the idea of a mole as a number (vs. an animal)

Molarity vs. Molality

Learn how molarity and molality differ! Rishi is a pediatric infectious disease physician and works at Khan Academy.

Molarity vs. Osmolarity

Learn about osmoles and figure out how to calculate osmolarity really easily. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Calculate your own osmolarity

Learn how to use three lab values (Sodium, glucose, and BUN) to approximate your plasma osmolarity. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Molarity, Molality, Osmolarity, Osmolality, and Tonicity - What's the difference?

See how each of these terms tells us something different about a solution. Rishi is a pediatric infectious disease physician and works at Khan Academy.

Tonicity - comparing 2 solutions

Find out how tonicity is determined by ions that don't move across membranes and how it affects the movement of water. Rishi is a pediatric infectious disease physician and works at Khan Academy.