rounding

0 I am confused about the rounding for med math. Would 0.6666666 mL always be rounded to 0.7 or does it depend on if it is mg, mL , etc?
What about 1.6666666? 

Mar 26, '08 by Daytonite0.6666666 is a number expressed as a decimal and can be rounded to 0.7
mg and mL are units of measurement, not numbers. 
Mar 26, '08 by EricJRNOften it depends on how many decimal places are used in each component of the original question or calculation, a concept known as significant digits.
If I'm on the unit and calculating a volume or dosage, the answer usually depends on my equipment. In giving a small dose of medication, it makes sense to round to two decimals, since this is the most precise that my 1 mL syringe will get (the big dashes are 0.1 and the little ones are 0.01). 
Mar 27, '08 by care4u2010[FONT=TimesNewRoman,Bold]GENERAL RULES FOR ROUNDING OFF
[FONT=TimesNewRoman,Bold]General Rounding Rule: When rounding off numbers 5 and above, round up.[FONT=TimesNewRoman,Bold]
Numbers below 5, round downCalculation Caution: Round appropriately when performing calculations that require123.7 ml/hour = 124 ml
multiple steps. Do not leave unrounded numbers in your calculator when you go to the
next step.
I. Capsules and tablets
Whole capsules or tablets (which are not scored) should be rounded to the nearest
whole number. The difference should not exceed 10% of total amount ordered.
Ex.: 1.8 capsules = 2 capsules
1.5 scored tablets = 1 ½ tablets
II. Liquid medications by mouth
If unable to accurately measure dose on available medication cup, use a syringe
to obtain accurate measurement of dose.
III. Milliliters
A. Volumes greater than 1 ml. or cc: Volumes using ml or cc’s greater than 1
should be divided to the hundredths place and rounded to the nearest tenth.
Ex.: 1.25 ml = 1.3 ml
1.24 ml = 1.2 ml
B. Volumes less than 1 ml or cc: Volumes using ml or cc’s less than 1 ml should
be divided to the thousandths place, and rounded to the nearest hundredth.
A TB syringe is appropriate for this measurement.
Ex.: .969 = .97 ml
.963 = .96 ml
IV. Converting pounds to kilograms
When converting pounds to kilograms, the weight should be carried to the
hundredths place and rounded to the tenths place.
Ex. 170 lbs = 77.27 kg = 77.3 kg
160 lbs = 72.72 kg = 72.7 kg
V. Drops
Calculate to the tenths place and round off to the nearest whole number.
Ex. 15.4 = 15 drops
15.5 = 16 drops
VI. Setting an IV pump (Exception: do not round off for heparin infusions)
Round fractions of ml to the whole ml using the general rounding rule.
Ex. 123.3 ml/hour = 123 ml