ISO: International Standards Organization
SI: System International Units

Factor Prefix Symbol for Lab Unit
10^12 tetra T
10^9 giga G
10^6 mega M
10^3 kilo k
10^(-3) milli m
10^(-6) micro µ
10^(-9) nano n
10^(-12) pico p
10^(-15) femto f
10^(-18) atto a

So in the CTPM RBC code 00533 is SI unit TI/L or 10^12  * 1 = 10^6/uL
and WBC is SI unit GI/L or 10^9   * 1 = ISO 10^3/uL

Also mg = milli gram = one-thousandth of a gram. 1 g = 100 mg
1 mg = 1000 mcg or ug, here mc stands for "micro-" meaning "one millionth of".
In cell counts, the results may be reported as #/cumm, here cumm = mm^3 meaning per cubic millimeter.

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