Is total homocysteine the same as homocysteine?

Total homocysteine is the same as homocysteine.

Homocysteine and homocysteine are different names for the same substance, which is often referred to as homocysteine in clinical practice. Homocysteine includes bound homocysteine and unbound homocysteine, in which bound homocysteine exists in the form of disulfide bonds and protein binding; unbound homocysteine exists in the form of cystine or cysteine-homocysteine. Together they are called total homocysteine, or homocysteine, so total homocysteine is the same as homocysteine.