The mid-upper arm circumference (sometimes abbreviated as MUAC) is the circumference of the upper arm half way between the olecranon process of the ulna and the acromion process of the scapula. It is measured with a non-stretchable tape measure, and is expressed in centimeters. The mid-upper arm circumference is a recognized and important anthropometric measure in children and in pregnant women to assess their nutritional status. This class represents an Observation Clinical Statement wherein the Arm Circumference has been Evaluated, which can be used in a variety of other models as if it were a datatype.

The body mass index (BMI) is a value derived from the mass (weight) and height of an individual. The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m2, resulting from mass in kilograms and height in meters. The BMI is an attempt to quantify the amount of tissue mass (muscle, fat, and bone) in an individual, and then categorize that person as underweight, normal weight, overweight, or obese based on that value. It is noted that health risks associated with BMI differ depending on the person's race, so the definition of overweight, obese, etc. may need to be adjusted based on the patient's race. - adapted from wikipedia. This class represents an Observation Clinical Statement wherein the Body Mass Index has been Evaluated, which can be used in a variety of other models as if it were a datatype. "BMI if calculated in the source system. Decimal precision is permissible." - PCORnet Common Data Model, Vital.Original_BMI

The relative position of the patient's body mass index (BMI) among a given population. This class represents an Observation Clinical Statement wherein the Body Mass Index Percentile has been Evaluated.

The estimated date of delivery (EDD), also known as the estimated due date or expected date of confinement (the latter now considered to be an archaic term), is a term describing the date upon which a pregnant woman is predicted to give birth. While childbirth on average occurs at a gestational age of 280 days (40 weeks), there is considerable variation on this average, and the actual conception date may only be estimated, it may be more helpful to describe this date as a range rather than a single "due date". The EDD is typically determined based on the first day of a woman's last menstruation. See Naegele's rule. This class represents an Observation Clinical Statement wherein the Estimated Due Date has been Evaluated, which can be used in a variety of other models as if it were a datatype.

The Gestational Age of a fetus or pre-maturely born infant is the number of weeks since the actual beginning of the mother's last menstrual period preceeding the pregnancy. This datum is used both prenatally and postnatally to estimate various risk factors. This datum may be used to determine the nutritional needs for infants. This class represents a Observation Clinical Statement wherein the Gestational Age has been Evaluated.

The date when the Patient last experienced a menstrual cycle. This date may be imprecise (e.g., sometime in February of the current year). This class represents an Observation Clinical Statement wherein the Last Menstrual Period Start Date has been Evaluated, which can be used in a variety of other models as if it were a datatype.

Indicates whether the Patient is known to be pregnant (carrying offspring within her body). This class represents an Observation Clinical Statement wherein the Pregnancy Status has been Evaluated, which can be used in a variety of other models as if it were a datatype.

Whether and how much the Patient smokes tobacco products. This Smoking Status observation is specific to Meaningful Use (MU), and is bound to a set of eight possible MU-prescribed answer values. This class represents an Observation Clinical Statement wherein the patients smoking status has been evaluated, which can be used in a variety of other models as if it were a datatype. "Indicator for any form of tobacco that is smoked." - PCORnet Common Data Model, Vital.BP_Position. Possible values include: Current every day smoker; Current some day smoker; Former smoker; Never smoker; Smoker, current status unknown; Unknown if ever smoked; Heavy tobacco smoker; Light tobacco smoker; No information; Unknown; Other.

"The triceps skin fold is the width of a fold of skin taken over the triceps muscle. It is measured using skinfold calipers. The measurement is taken at a standardized position at the midpoint of the back of the upper arm." - wikipedia This class represents a Clinical Statement wherein the Tricepts Skin Fold has been Evaluated.