👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: low parathyroid · underactive parathyroid · low calcium from parathyroid · too little PTH
💡
Use this quick-reference guide to spot, treat, and prevent Hypoparathyroidism on the NCLEX. Keep it handy during review and on exam day!
🩺
📒 The 1-minute cheat sheet
⚠️ Causes
Thyroidectomy removed parathyroids
Neck surgery/radiation damage
🧪 Labs
↓ Ca <9, ↑ phosphate
↓ PTH level
🩺 Signs
Trousseau + Chvostek signs
Tetany, tingling, muscle cramps
Laryngospasm, seizures = severe
✅ Do
IV calcium gluconate if acute
Oral Ca + vitamin D long-term
Seizure precautions, trach at bedside
📚 Hypoparathyroidism — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Hypoparathyroidism is deficient parathyroid hormone (PTH), causing hypocalcemia and high phosphorus. The most common cause is accidental damage to or removal of the parathyroid glands during thyroid or neck surgery. Low calcium increases nerve and muscle excitability, producing tetany. Memory aid: it is the opposite of hyperparathyroidism, so think low calcium, high phosphorus, and twitchy, irritable muscles.
🔑
Key points
Understand these first
PTH deficiency causes hypocalcemia and hyperphosphatemia.
Low calcium increases neuromuscular excitability, producing numbness and tingling around the mouth and in the fingers.
Muscle cramps, spasms, and tetany occur, and severe cases cause laryngospasm and seizures.
Positive Trousseau sign (carpal spasm with BP cuff inflation) and Chvostek sign (facial twitch when tapping the cheek) are classic.
It is most commonly caused by inadvertent injury or removal of parathyroid tissue during neck/thyroid surgery.
✅
Nursing priorities
What to do, in order
Administer calcium and vitamin D as ordered, and keep IV calcium gluconate available for acute, severe hypocalcemia.
Monitor for tetany, assess Trousseau and Chvostek signs, and institute seizure precautions.
Continuously monitor airway and respiratory status for laryngospasm and stridor.
Monitor cardiac rhythm, as hypocalcemia can prolong the QT interval and cause dysrhythmias.
Provide a high-calcium, low-phosphorus diet as ordered.
🚩
Red flags — report now
Escalate immediately
Laryngospasm, stridor, or respiratory difficulty is a life-threatening airway emergency requiring immediate intervention.
Report seizures, severe tetany, or carpopedal spasm immediately.
Report prolonged QT interval or dysrhythmias on cardiac monitoring.
🧪
Labs & values
Numbers to know
Calcium: low (normal 9.0-10.5 mg/dL)
Phosphorus: high (normal 3.0-4.5 mg/dL)
PTH: low (normal 10-65 pg/mL)
🗣️
Patient teaching
What patients must know
Take calcium and vitamin D supplements for life as prescribed.
Eat a high-calcium, low-phosphorus diet, limiting dairy excess and high-phosphorus foods as directed.
Report numbness, tingling, muscle cramps, or spasms promptly.
❓ Hypoparathyroidism: NCLEX FAQs
What are the priority nursing interventions for Hypoparathyroidism?
Administer calcium and vitamin D as ordered, and keep IV calcium gluconate available for acute, severe hypocalcemia. Monitor for tetany, assess Trousseau and Chvostek signs, and institute seizure precautions. Continuously monitor airway and respiratory status for laryngospasm and stridor. Monitor cardiac rhythm, as hypocalcemia can prolong the QT interval and cause dysrhythmias.
What are the warning signs of Hypoparathyroidism a nurse must report?
Laryngospasm, stridor, or respiratory difficulty is a life-threatening airway emergency requiring immediate intervention. Report seizures, severe tetany, or carpopedal spasm immediately. Report prolonged QT interval or dysrhythmias on cardiac monitoring.
What do I need to know about Hypoparathyroidism for the NCLEX?
PTH deficiency causes hypocalcemia and hyperphosphatemia. Low calcium increases neuromuscular excitability, producing numbness and tingling around the mouth and in the fingers. Muscle cramps, spasms, and tetany occur, and severe cases cause laryngospasm and seizures. Positive Trousseau sign (carpal spasm with BP cuff inflation) and Chvostek sign (facial twitch when tapping the cheek) are classic.
What patient teaching is important for Hypoparathyroidism?
Take calcium and vitamin D supplements for life as prescribed. Eat a high-calcium, low-phosphorus diet, limiting dairy excess and high-phosphorus foods as directed. Report numbness, tingling, muscle cramps, or spasms promptly.
✨
Quick Tip
PTH deficiency causes hypocalcemia and hyperphosphatemia.