Hemoglobin: The oxygen-carrying pigment and predominant protein in the red blood cells. Hemoglobin forms an unstable, reversible bond with oxygen. In its oxygenated state it is called oxyhemoglobin and is bright red.
Caffeine by McDonalds Iced Coffee Size. 1  Medium (16 floz): 133mg. 2  Large (22 floz): 200mg. 3  Extra Large (32 floz): 320mg.
Caffeine in McDonalds coffee can vary wildly depending coffee blend, roasting method, coffee variety. McDonalds doesn't test their coffee's caffeine content but uses the average caffeine content published by USDA for the standard amount of ground coffee used per 8oz of water.Click here to see our complete McCafe Caffeine Guide.cDonalds Coffee is a popular less expensive coffee choice available at McDonalds restaurants. It has changed throughout the years as McDonalds has tried out different blends and roasts, but it remains popular. In most locations it is now called McCafe Brewed Coffee.