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From your first class to your first shift.

MLS and MLT students learn medical laboratory science here with guided lessons, exam questions, lab cases and daily review, all free.

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Calculations

from Dilution Math
Question

You need 1,000 µL of a 1:5 dilution, defined as one specimen part in five total parts. Which volumes prepare it?

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HematologyBlood BankingImmunologyMicrobiologyUrinalysis and OtherBody FluidsChemistryCalculationsLaboratory OperationsLessonDilution MathStationDilution stationBack in review

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Inside the program

Six lab stations, a full MLS exam and a guided path through every department.

The MLS exam, question by question

100 questions in 150 minutes, drawn to the same blueprint: 20 each from Blood Banking, Chemistry, Hematology and Microbiology, and 20 that rotate through the rest.

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A guided path, one step at a time

  1. Red-cell indices
  2. How analyzers count cells and measure hemoglobin
  3. Reticulocyte counts and the marrow response
  4. Chamber counts and the NRBC correction
See the guided course

Incoming: 4 North, ext. 4230

Call a critical result

Identify the patient, give the result with a read-back and close the report.

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Look up any topic

All 104 lessons are written and reviewed by an ASCP-certified medical laboratory scientist, cited from open sources and dated.

Water Balance, Sodium, and Potassium

Interpreting a sodium or potassium result starts with the distribution of body water and these two ions.

  1. Osmolality and its measurement
  2. Thirst, vasopressin, and volume regulation
  3. Calculated osmolality and the osmolal gap
  4. Sodium
  5. Potassium

11 sourcesChecked October 26, 2026

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