3.5 Measurement, Intake & Output, and Specimens

Measuring Height and Weight

Height and weight are baseline measurements the care team uses to track health, calculate medication doses, and catch unplanned change. A sudden weight gain can mean fluid retention (edema); a steady loss can mean poor nutrition or illness - so accuracy and consistency matter.

Weight - the rules for an accurate, comparable reading:

• Weigh at the same time of day (usually before breakfast, after voiding).
• Use the same scale each time and make sure it reads zero (balanced) first.
• Have the resident wear similar clothing and remove shoes.
• For a bedbound resident, use a bed or chair scale and follow the device steps.

Height: A resident who can stand is measured standing straight against a height rod, heels together, looking forward. For a bedbound resident, measure with a tape from the top of the head to the bottom of the heel while the resident lies flat and straight. Record weight in pounds (or kg) and height in inches (or cm) as the facility requires, and report a significant change to the nurse.

Intake and Output (I&O)

Intake and output (I&O) tracks all the fluid a resident takes in and puts out over a shift or 24 hours. It helps the team detect dehydration (too little fluid) or fluid overload (too much). Measurements are recorded in milliliters (mL), also written as cubic centimeters (cc) - they are equal.

The conversion you must know cold: 1 ounce (oz) = 30 mL. This single fact is one of the most reliably tested items on the exam.

A simple rule: anything liquid at room temperature counts as intake, which is why gelatin, ice cream, and popsicles are included but a sandwich is not. Measure urine in a graduate (calibrated measuring container), set it on a flat surface, and read it at eye level for accuracy. Report low output, dark concentrated urine (a dehydration sign), or any blood. Watch for and report edema (swelling of feet, ankles, or hands), which can signal fluid overload.

Worked I&O Calculation

Let's add up a typical lunch. The exam loves these conversions, so practice the steps: multiply each ounce amount by 30 mL, then total.

Example: At lunch, Mrs. Patel consumes:

• 8 oz of milk
• 4 oz of apple juice
• 6 oz of broth
• A 4-oz cup of gelatin (counts as fluid)

Step 1 - convert each to mL (oz x 30):

• Milk: 8 x 30 = 240 mL
• Juice: 4 x 30 = 120 mL
• Broth: 6 x 30 = 180 mL
• Gelatin: 4 x 30 = 120 mL

Step 2 - add them up: 240 + 120 + 180 + 120 = 660 mL total intake.

Note the gelatin is counted because it is liquid at room temperature. If she had also chewed on 8 oz of ice chips, you would count them as half: 8 x 30 = 240 mL, divided by 2 = 120 mL, bringing the total to 780 mL. You record the result in the I&O record in mL and report it to the nurse if intake is unusually low.

This is exactly the kind of calculation a written question presents - get comfortable converting ounces to milliliters quickly and remembering the ice-chip rule.

Basic Specimen Collection

Nurse aides often collect specimens for lab testing. Always follow standard precautions, wear gloves, label the container correctly (right resident, date, time), and avoid contaminating the inside of the container or lid.

Urine specimens:

• Routine (random) - the resident voids into a clean container or specimen "hat" placed in the toilet; pour into the labeled container.
• Clean-catch (midstream) - used to test for infection, so it must be as germ-free as possible. Clean the perineal area front to back, have the resident start the stream into the toilet, then catch the middle (midstream) portion in a sterile container, and finish voiding in the toilet. Discarding the first and last urine reduces contamination.
• 24-hour urine - collect all urine for 24 hours; discard the first void to start the clock, then save every drop, keeping the container cool.

Stool specimen: Have the resident defecate into a clean container or hat (not into the toilet water), then transfer a sample with a tongue blade into the labeled container without urine mixed in.

Blood-Glucose Awareness

In most facilities, a blood-glucose (blood-sugar) test by fingerstick is done by a nurse or a specially trained/certified aide - know your facility's policy and scope. Even when you do not perform the test, you must recognize and report warning signs:

• Hypoglycemia (low blood sugar): shakiness, sweating, dizziness, confusion, hunger, rapid pulse - a quick emergency; report immediately.
• Hyperglycemia (high blood sugar): excessive thirst, frequent urination, fatigue, fruity breath.

A commonly cited normal fasting range is about 70-100 mg/dL; report values outside the resident's ordered range to the nurse.

Documentation Accuracy

Everything you measure must be recorded accurately, objectively, promptly, and in the correct units. Chart only the facts (what you measured or observed), never opinions or guesses; use approved abbreviations; correct an error with a single line through it (never erase or use white-out) per facility policy; and never chart care before it is done or for another worker. Accurate records protect the resident and are a legal document.