The deciliter (dL) is a metric unit of volume equal to one-tenth of a liter, used in medical lab reports and some European recipes. Blood test results in many countries express cholesterol and glucose levels in milligrams per deciliter, making this unit familiar to anyone reviewing health data. One deciliter equals exactly 100 milliliters or roughly 3.381 fluid ounces.

The teaspoon (tsp) is the smallest standard cooking volume unit, equal to approximately 4.929 milliliters, found in recipes worldwide for measuring small quantities of spices, extracts, and medicine. It serves as the building block for larger measurements, with three teaspoons making one tablespoon. One US teaspoon equals exactly 1/6 of a US fluid ounce.