diff --git a/src/Checks/Php/Extensions.php b/src/Checks/Php/Extensions.php
new file mode 100644
index 0000000..531d000
--- /dev/null
+++ b/src/Checks/Php/Extensions.php
@@ -0,0 +1,34 @@
+<?php
+namespace Health\Checks\Php;
+
+use Health\Checks\BaseCheck;
+use Health\Checks\HealthCheckInterface;
+
+class Extensions extends BaseCheck implements HealthCheckInterface
+{
+
+    /**
+     *
+     * {@inheritdoc}
+     * @see \Health\Checks\HealthCheckInterface::call()
+     */
+    public function call()
+    {
+        $builder = $this->getBuilder();
+
+        $extensions = $this->getParam('extensions', []);
+        $errors = [];
+
+        foreach ($extensions as $extension) {
+            if (! extension_loaded($extension)) {
+                $errors[] = $extension;
+            }
+        }
+
+        if ($errors) {
+            $builder->down()->withData('errors', $errors);
+        }
+
+        return $builder->build();
+    }
+}
\ No newline at end of file
diff --git a/tests/Checks/PhpExtensionsTest.php b/tests/Checks/PhpExtensionsTest.php
new file mode 100644
index 0000000..eea3362
--- /dev/null
+++ b/tests/Checks/PhpExtensionsTest.php
@@ -0,0 +1,25 @@
+<?php
+namespace Tests\Checks;
+
+use Health\Checks\Php\Extensions;
+
+class PhpExtensionsTest extends CheckTestCase
+{
+
+    public function testCheckPhpConfigOptions()
+    {
+        $this->assertCheck($this->runCheck(Extensions::class, []), 'UP');
+
+        $this->assertCheck($this->runCheck(Extensions::class, [
+            'extensions' => [
+                'nosuch'
+            ]
+        ]), 'DOWN');
+
+        $this->assertCheck($this->runCheck(Extensions::class, [
+            'extensions' => [
+                'mbstring'
+            ]
+        ]), extension_loaded('mbstring') ? 'UP' : 'DOWN');
+    }
+}
\ No newline at end of file