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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.
 
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length (length)   an expression of the longest dimension of an object, or of the measurement between its two ends.
 

crown-heel length(CHL)    the distance from the crown of the head to the heel in embryos, fetuses, and infants; the equivalent of standing height in older persons.

crown-rump length(CRL)    the distance from the crown of the head to the breech in embryos, fetuses, and infants; the equivalent of sitting height in older subjects.

cycle length  in cardiac pacing terminology, the time interval in milliseconds from one event to the next; it is the inverse of the intrinsic rate (beats per minute) or the paced rate (pulses per minute).

focal length  the distance between a lens and an object from which all rays of light are brought to a focus.





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